Pulsar PHD vaporizer batteries fit most thick oil cartridges up to 11mm in diameter. A magnetic cart connector with universal 510 threading allows for cartridges to be dropped into the battery's cart chamber, making it simple to switch them out. This unique vape battery also functions as a pre-heat device by pre-warming the entire cartridge for optimal vaping performance. Perfect for some of the 510 vape cartridges that crystalize. No need to run the cartridge under hot water or roll it in your hands. This 510 Battery does all that work for you. 510 Cartridges are sold separately.